94 



KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



* Group 5. Wing, over 15 inches long. 



Plumage, entirely white; wing, over 17 inches; bill, over 5.50; tarsus, over 7.25. 



Ardea occiaentaUs. Great White Heron. 

 See No. 143. 



Plumage, entirely white; wing, less than 17 inches long; bill, under 5.50; tarsu-i, 

 under 7.25. Ardea egretta. American Egret. 



See No. 153. 



Greater part of upper plumage, bluish gray or slaty gray; adults in breeding have 

 middle of crown and throat, white ; bill, less than 6.25 ; immature birds have the top of the 

 head, black. Ardea herodias. Great Blue Heron. 



See No. 151. 



Similar to Great Blue Heron, but larger; bill, over 6.25. Occurs only in Florida. 



Ardea wardi. Ward's Heron. 

 See No. 150. 



Top of head and sometimes greater portion of head, white ; wings and back, bluish gray. 

 or slaty gray ; general appearance of Ward's Heron except color of head. Occurs only in 

 Florida ; probably a color phase of Ardea occidentalis. 



Ardea wuerdemanni. Wuerdeman's Heron. 

 See No. 149. 



* For directions for measurement, see page y. 



